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Mox: detection of switch module on TOS 6.0 always returns first module

TOS 6.0

Detection of mox switch module number fails to tell modules apart, because phys_switch_id always has value 00000000 for all switch ports.

Which in turn means that we can't easily tell which eth port belongs to which mox module.

interfaces-mox-tos-6.png

TOS 5.3.x

On TOS 5.3.x different switch ports returned different phys_switch_id based on the physical mox module, e.g.:

  • 00000000 -> switch 0
  • 01000000 -> switch 1
  • 02000000 -> switch 2
  • ...

interfaces-mox-tos-5.3

Proposed solution

Determine the Mox module number by looking into /sys/class/net/<iface>/device/of_node real path.

For example single topaz module:

/sys/class/net/lan4/device/of_node -> [..]/firmware/devicetree/base/soc/internal-regs@d0000000/mdio@32004/switch0@2

Will identify switch as switch0@2 -> switch 0.

These switchX@Y identifiers should be stable, because they are defined in kernel DTS.

Edited by Martin Matějek
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